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Problem. The constant list 'Bar' contains an entry 'Bar' which isn't any form of constant I'm able to read.
Note that lists have to be written with spaces before commas, so I like '{2, 4}' but not '{2,4}', for instance.
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appears twice for the attached source.

Minimal Source Text To Reproduce

There is a room.
Foo is a list of objects that varies.
Foo is { Bar }.